Why choose a conical alumina crucible instead of a cylindrical crucible?

A conical alumina crucible helps concentrate ash, powder or residue at the bottom, which can make pour-out, weigh-back and sample recovery easier. A cylindrical crucible is often preferred when users need a larger flat bottom or more uniform vertical loading space.

Which alumina purity should I choose?

The right purity depends on temperature, sample chemistry and contamination sensitivity. 96% alumina is often selected for cost-effective thermal processing, while 99%, 99.6% and 99.7% alumina are preferred when cleaner material contact, higher temperature capability or lower impurity risk is required.

Can arc-shaped alumina crucibles be supplied with lids?

Yes. ADCERAX can supply arc-shaped alumina crucibles with flat, recessed or vented lids. Lid selection depends on whether the process requires contamination control, gas release, easier handling or reduced sample exposure during heating.

How can I reduce cracking during furnace use?

Use gradual heating and cooling, avoid sudden thermal shock, keep sample loading balanced and do not place a hot crucible on a cold metal surface. Larger crucibles, thick-wall designs and moisture-containing samples usually require more careful furnace ramp control.

What chemicals or materials should be avoided?

Alumina is compatible with many high-temperature and laboratory processes, but it should not be used with hydrofluoric acid, strong hot alkalis or reactive fluxes unless compatibility has been confirmed. For molten metals, salts or aggressive chemistries, material suitability should be reviewed before ordering.

What information should I provide for a custom arc-shaped alumina crucible?

Please provide the required capacity, top diameter, bottom diameter, height, wall thickness, cone angle, lid type, alumina purity, quantity and application conditions. A drawing, sample photo or furnace fixture requirement will help us review manufacturability more accurately.

Arc-Shaped Alumina Crucibles for Ashing & Calcination

What Are Arc-Shaped Alumina Crucibles?

Arc-shaped alumina crucibles are conical or tapered Al₂O₃ ceramic containers designed for heating powders, ash samples, small melts and ceramic materials in laboratory or furnace environments. Their sloped wall geometry helps guide residue toward the lower section of the crucible, making sample recovery, pouring and post-heating inspection easier than with many straight-wall crucibles.

They are commonly selected for ashing, calcination, drying, powder preparation, gravimetric analysis and small-batch material testing where thermal stability, low contamination and repeatable handling are important.

Why Use Arc-Shaped Alumina Crucibles?

Tapered Shape for Easier Residue Collection

The conical body helps concentrate ash, powder or melted residue at the lower section of the crucible. This makes sample transfer, weighing and post-heating recovery easier during lab ashing, calcination and material testing.

Stable Al₂O₃ Ceramic Body for Furnace Heating

Alumina ceramic provides strong thermal stability for controlled furnace heating, powder calcination and high-temperature laboratory workflows. It is suitable for processes that require clean ceramic contact and stable handling during repeated heating cycles.

Optional Lids for Cleaner Sample Handling

Matching lids can help reduce dust fall-in, sample exposure and contamination during heating. Vented or loose-fit lid designs can also be reviewed when the process requires gas release during ashing or calcination.

Standard and Custom Sizes for Different Workflows

ADCERAX supplies common lab volumes as well as drawing-based custom sizes. Buyers can specify top diameter, height, wall thickness, bottom profile and lid fit according to the furnace chamber, sample volume and handling method.

Multiple Alumina Purity Options

Different alumina grades can be selected according to working temperature, contamination sensitivity and budget requirements. Higher-purity alumina is often preferred for cleaner sample contact, analytical work and high-temperature material processing.

Suitable for Repeat Lab and R&D Use

The arc-shaped geometry supports consistent loading, heating, cooling and residue recovery procedures. It is useful for laboratories, R&D teams and furnace operators that need repeatable sample handling in small-batch thermal processes.

Typical Alumina Material Properties for Crucible Selection

The following values are typical reference properties for alumina ceramic grades used in crucible manufacturing. Final material selection should be reviewed according to furnace temperature, atmosphere, heating rate, sample chemistry, wall thickness and handling method.

Property	Unit	96% Al₂O₃	99% Al₂O₃	99.5% Al₂O₃	99.6% Al₂O₃	99.7% Al₂O₃	99.8% Al₂O₃	99.9% Al₂O₃	99.99% Al₂O₃
Alumina content	%	96	99	99.5	99.6	99.7	99.8	99.9	99.99
Density	g/cm³	3.6-3.75	3.83	3.89	3.91	3.92	3.93	3.94	3.98
Color	–	white	Ivory	Ivory	Ivory	Ivory	Ivory	Ivory	Ivory
Water absorption	%	0	0	–	0	0	0	0	0
Young’s modulus (Elastic modulus)	GPa	300	350	375	356	357	358	359	362
Shear modulus	GPa	–	–	152	–	–	–	–	–
Bulk modulus	GPa	–	–	228	–	–	–	–	–
Poisson’s ratio	–	–	–	0.22	–	–	–	–	–
Compressive strength	MPa	1910	2210	2600	2552	2554	2556	2558	2570
Flexural strength	MPa	260	300	379	312	313	314	315	320
Fracture toughness	MPa·m¹ᐟ²	–	–	4	–	–	–	–	–
Hardness	GPa	14.5	17	17	23	24	25	26	30
Thermal conductivity	W/m·K	22	24	35	32–37	33–38	34–39	35–40	36–42
Thermal shock resistance ΔT	°C	–	–	–	222	223	224	225	228
Maximum use temperature (no load)	°C	1450	1680	≤1750	1755	1760	1765	1770	1800
Coefficient of thermal expansion	10⁻⁶/°C	7.6	7.6	8.4	–	–	–	–	–
Volume resistivity	Ω·cm	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴	>1×10¹⁴
Dielectric constant (relative permittivity)	–	9.2	9.5	9.8	9.83	9.84	9.85	9.86	9.92
Dielectric strength	kV/mm	15	19	16.9	23.2	23.4	23.6	23.8	24
Dissipation factor (loss factor @ 1 kHz)	–	–	–	0.0002	–	–	–	–	–

Standard Size Range for Arc-Shaped Alumina Crucibles

ADCERAX supplies standard arc-shaped alumina crucibles from small analytical volumes to larger furnace-processing sizes. The table below shows commonly available dimensions. For tighter tolerance, special cone angle, matching lids or non-standard capacity, please send a drawing, sample photo or required working volume for review.

Item NO.	Volume(ml)	TOP Diameter(mm)	Bottom Diameter (mm)	Height(mm)
TE-AC-001	1	15	10	7
TE-AC-002	1.5	20	15	9
TE-AC-003	2.5	37	35	5.5
TE-AC-003-1	3	20	16	17
TE-AC-004	3	17	11	25
TE-AC-005	3	20	16	17
TE-AC-006	4	25	14	20
TE-AC-006-1	4	22	14	24
TE-AC-006-2	4	25	19	18
TE-AC-007	4	22	14	24
TE-AC-008	4	25	19	18
TE-AC-008-1	5	26	18	21
TE-AC-009	5	25	18	22
TE-AC-009-1	5	26	18	21
TE-AC-010	7	28	21	13
TE-AC-010-1	8	24	16	32
TE-AC-011	10	28	20	27
TE-AC-011-1	10	30	20	28
TE-AC-011-2	10	29	18	34
TE-AC-012	10	30	18	30
TE-AC-013	9	38	28	17
TE-AC-013-1	10	28	20	32
TE-AC-013-2	15	31	21	35
TE-AC-014	10	30	20	28
TE-AC-015	15	32	21	35
TE-AC-016	15	35	21	30
TE-AC-016-1	10	29	18	34
TE-AC-016-2	20	36	23	41
TE-AC-017	19	34	20	38
TE-AC-017-1	20	36	23	41
TE-AC-018	20	34	24	39
TE-AC-018-1	20	38	24	35
TE-AC-019	20	35	18	35
TE-AC-020	20	38	20	29
TE-AC-021	20	38	24	35
TE-AC-022	25	36	22	42
TE-AC-023	25	39	24	38
TE-AC-023-1	30	38	25	45
TE-AC-023-2	25	39	24	35
TE-AC-023-3	30	45	27	39
TE-AC-023-4	40	46	30	40
TE-AC-023-5	30	38	25	45
TE-AC-024	30	37	24	45
TE-AC-025	30	39	24	49
TE-AC-026	30	45	27	39
TE-AC-027	30	46	25	40
TE-AC-027-1	40	45	30	46
TE-AC-028	40	46	30	40
TE-AC-029	50	52	30	50
TE-AC-029-1	50	48	30	52
TE-AC-030	50	52	32	50
TE-AC-030-1	50	50	30	48
TE-AC-030-2	70	56	35	56
TE-AC-030-3	50	48	30	52
TE-AC-031	50	50	30	54
TE-AC-032	50	50	30	48
TE-AC-033	50	56	30	45
TE-AC-034	70	56	35	56
TE-AC-035	90	55	48	53
TE-AC-036	100	57	37	68
TE-AC-037	100	61	36	54
TE-AC-037-1	100	58	35	68
TE-AC-038	100	61	36	60
TE-AC-039	100	62	40	53
TE-AC-040	120	66	30	55
TE-AC-040-2	100	61	31	60
TE-AC-040-3	100	58	35	68
TE-AC-041	120	63	33	73
TE-AC-042	140	55	48	72
TE-AC-043	150	68	42	80
TE-AC-043-1	150	67	42	78
TE-AC-043-2	150	67	41	80
TE-AC-043-3	150	67	42	78
TE-AC-044	150	73	43	67
TE-AC-044-1	150	73	43	67
TE-AC-045	200	70	44	85
TE-AC-046	200	82	43	70
TE-AC-046-1	200	73	48	86
TE-AC-046-2	200	82	43	70
TE-AC-046-3	250	90	53	76
TE-AC-047	200	83	48	86
TE-AC-048	250	75	51	93
TE-AC-049	250	90	53	76
TE-AC-049-1	200	73	48	86
TE-AC-049-2	300	83	52	106
TE-AC-050	300	83	52	106
TE-AC-051	300	88	53	85
TE-AC-051-1	350	82	56	112
TE-AC-051-2	350	99	50	82
TE-AC-051-3	300	83	52	106
TE-AC-052	400	75	56	122
TE-AC-053	400	80	58	108
TE-AC-054	400	86	49	135
TE-AC-055	500	86	50	140
TE-AC-055-1	500	100	60	118
TE-AC-055-2	500	108	62	108
TE-AC-055-3	800	113	83	150
TE-AC-056	500	100	60	118
TE-AC-057	500	108	62	108
TE-AC-057-1	350	87	54	102
TE-AC-058	600	88	54	145
TE-AC-059	600	100	68	118
TE-AC-060	600	100	65	128
TE-AC-060-1	750	112	70	132
TE-AC-061	750	112	70	132
TE-AC-062	800	113	62	140
TE-AC-063	850	100	68	150
TE-AC-063-1	750	112	70	132
TE-AC-063-2	1000	125	80	146
TE-AC-063-3	1500	140	90	170
TE-AC-063-4	1000	125	80	146
TE-AC-064	1000	120	75	143
TE-AC-064-1	1000	135	83	150
TE-AC-065	1250	112	75	160
TE-AC-066	1300	135	83	150
TE-AC-067	1350	120	80	155
TE-AC-068	1500	140	90	170
TE-AC-068-1	1500	140	90	170
TE-AC-068-2	3300	140	90	170
TE-AC-069	2000	150	93	200
TE-AC-070-1	2000	155	95	200
TE-AC-182	10	30	32	14
TE-AC-183	20	39	35	21
TE-AC-184	30	45	38	23
TE-AC-185	50	57	44	28
TE-AC-186	100	67	53	34
TE-AC-187	150	73	58	42
TE-AC-188	250	84	66	48
TE-AC-189	500	108	108	58
TE-AC-190	1200	140	116	90

*Note: The table above shows only some standard specifications. For more specifications, please refer to the complete product catalogue or contact us for customization.

Key Selection Factors for Arc-Shaped Alumina Crucibles

Selection Factor	What to Check
Alumina purity	Select the purity grade according to temperature, sample chemistry and contamination sensitivity.
Working volume	Match the crucible capacity to sample loading, residue recovery and available furnace space.
Wall thickness	Thin-wall designs heat faster, while thicker walls are better for more robust handling.
Lid design	Choose flat, recessed or vented lids according to contamination control and gas release needs.
Bottom profile	The arc-shaped bottom helps concentrate residue and supports easier sample recovery.
Furnace fit	Check chamber size, tongs access, heating profile and clearance around the crucible.
Chemical compatibility	Review the sample material, fluxes, molten compounds and cleaning method before ordering.

Packaging for Arc-Shaped Alumina Crucibles

ADCERAX packs arc-shaped alumina crucibles with protective inner wrapping, separated layers and reinforced outer cartons according to crucible size and quantity. For fragile thin-wall or large-volume crucibles, additional cushioning can be used to reduce edge chipping and breakage risk during international shipping.

Applications of Arc-Shaped Alumina Crucibles

Lab Ashing and Gravimetric Analysis

Arc-shaped alumina crucibles are used in ash testing and gravimetric workflows where residue recovery and clean transfer are important. The tapered body helps collect ash at the lower section, making it easier to remove residue and reduce material loss during post-heating handling.
Powder Calcination and Drying

For ceramic powders, catalyst materials, mineral samples and inorganic compounds, the conical form supports controlled loading and easier decanting after heating. Buyers should match the crucible volume, wall thickness and lid style to the powder bed depth and furnace cycle.
Small-Batch Melting and Material Screening

High-purity alumina crucibles can be used for selected small-batch melts, alloy trials or high-temperature material screening when alumina is chemically compatible with the material being processed. For reactive melts, fluxes or aggressive chemistries, material compatibility should be reviewed before ordering.
Ceramic and Inorganic Material R&D

Research labs use conical alumina crucibles for sample preparation, thermal treatment, formulation testing and repeat heating cycles. The shape is useful when operators need easier sample access, cleaner residue collection and better visual inspection after firing.
Muffle Furnace and Tube Furnace Workflows

Arc-shaped alumina crucibles can be placed in muffle furnaces or suitable furnace fixtures for ashing, calcination and heat treatment. The recommended size depends on furnace chamber space, tongs access, heating profile and whether a lid is required.

How to Use Arc-Shaped Alumina Crucibles Safely

Before Heating

Inspect the crucible for visible cracks, chips or edge damage before each cycle. Select a crucible size that leaves enough headspace for powder expansion, gas release or residue movement. When using a lid, confirm whether a flat, recessed or vented lid is more suitable for the sample and furnace process.
During Furnace Operation

Use a controlled heating and cooling profile, especially for thick-wall crucibles, larger sizes or moisture-containing samples. Avoid sudden insertion into a hot furnace unless the process has already been validated. Uneven sample loading, localized overheating and rapid cooling can increase thermal stress.
After Heating

Allow the crucible to cool gradually on a suitable refractory surface before weighing, cleaning or transferring residue. Do not quench hot alumina crucibles in water or place them on cold metal surfaces. For analytical workflows, use clean tongs and avoid cross-contamination between samples.
Cleaning and Storage

Remove loose residue after the crucible has cooled. If aqueous cleaning is used, dry the crucible completely before reuse. Avoid hydrofluoric acid, strong hot alkalis and reactive fluxes unless material compatibility has been confirmed. Store crucibles separately to prevent edge chipping.

Arc-Shaped Alumina Crucible FAQ

Q: Why choose a conical alumina crucible instead of a cylindrical crucible?
A: A conical alumina crucible helps concentrate ash, powder or residue at the bottom, which can make pour-out, weigh-back and sample recovery easier. A cylindrical crucible is often preferred when users need a larger flat bottom or more uniform vertical loading space.
Q: Which alumina purity should I choose?
A: The right purity depends on temperature, sample chemistry and contamination sensitivity. 96% alumina is often selected for cost-effective thermal processing, while 99%, 99.6% and 99.7% alumina are preferred when cleaner material contact, higher temperature capability or lower impurity risk is required.
Q: Can arc-shaped alumina crucibles be supplied with lids?
A: Yes. ADCERAX can supply arc-shaped alumina crucibles with flat, recessed or vented lids. Lid selection depends on whether the process requires contamination control, gas release, easier handling or reduced sample exposure during heating.
Q: How can I reduce cracking during furnace use?
A: Use gradual heating and cooling, avoid sudden thermal shock, keep sample loading balanced and do not place a hot crucible on a cold metal surface. Larger crucibles, thick-wall designs and moisture-containing samples usually require more careful furnace ramp control.
Q: What chemicals or materials should be avoided?
A: Alumina is compatible with many high-temperature and laboratory processes, but it should not be used with hydrofluoric acid, strong hot alkalis or reactive fluxes unless compatibility has been confirmed. For molten metals, salts or aggressive chemistries, material suitability should be reviewed before ordering.
Q: What information should I provide for a custom arc-shaped alumina crucible?
A: Please provide the required capacity, top diameter, bottom diameter, height, wall thickness, cone angle, lid type, alumina purity, quantity and application conditions. A drawing, sample photo or furnace fixture requirement will help us review manufacturability more accurately.

Catalog No.	TE-AC-001
Material	Al2O3
Purity	96% 99% 99.5% 99.7%
Density	3.6~3.93 g/cm3
Dimensions/Sizes	See standard size table below

Arc-Shaped Alumina Crucibles for Ashing, Calcination & Small-Batch Heating

What Are Arc-Shaped Alumina Crucibles?

Why Use Arc-Shaped Alumina Crucibles?

Tapered Shape for Easier Residue Collection

Stable Al₂O₃ Ceramic Body for Furnace Heating

Optional Lids for Cleaner Sample Handling

Standard and Custom Sizes for Different Workflows

Multiple Alumina Purity Options

Suitable for Repeat Lab and R&D Use

Typical Alumina Material Properties for Crucible Selection

Standard Size Range for Arc-Shaped Alumina Crucibles

Key Selection Factors for Arc-Shaped Alumina Crucibles

Packaging for Arc-Shaped Alumina Crucibles

Applications of Arc-Shaped Alumina Crucibles

Lab Ashing and Gravimetric Analysis

Powder Calcination and Drying

Small-Batch Melting and Material Screening

Ceramic and Inorganic Material R&D

Muffle Furnace and Tube Furnace Workflows

How to Use Arc-Shaped Alumina Crucibles Safely

Before Heating

During Furnace Operation

After Heating

Cleaning and Storage

Arc-Shaped Alumina Crucible FAQ

Customize Arc-Shaped Alumina Crucibles for Your Furnace or Lab Workflow

Related Products

Alumina Ceramic Crucibles & Boat with Hole for Controlled Gas Flow and Cleaner Combustion Runs

Alumina Crucible with Lid for Ashing, Thermal Analysis and Custom Furnace Use

Cylindrical Alumina Crucible for Ashing, Calcination & Melting

Rectangular Alumina Crucibles with Lid & Custom Sizes

ADCERAX - Your Trusted Advanced Ceramics Manufacturing Partner

Get in Touch with Us

Ready to Solve Your Engineering Challenge?

Arc-Shaped Alumina Crucibles for Ashing, Calcination & Small-Batch Heating

What Are Arc-Shaped Alumina Crucibles?

Why Use Arc-Shaped Alumina Crucibles?

Tapered Shape for Easier Residue Collection

Stable Al₂O₃ Ceramic Body for Furnace Heating

Optional Lids for Cleaner Sample Handling

Standard and Custom Sizes for Different Workflows

Multiple Alumina Purity Options

Suitable for Repeat Lab and R&D Use

Typical Alumina Material Properties for Crucible Selection

Standard Size Range for Arc-Shaped Alumina Crucibles

Key Selection Factors for Arc-Shaped Alumina Crucibles

Packaging for Arc-Shaped Alumina Crucibles

Applications of Arc-Shaped Alumina Crucibles

Lab Ashing and Gravimetric Analysis

Powder Calcination and Drying

Small-Batch Melting and Material Screening

Ceramic and Inorganic Material R&D

Muffle Furnace and Tube Furnace Workflows

How to Use Arc-Shaped Alumina Crucibles Safely

Before Heating

During Furnace Operation

After Heating

Cleaning and Storage

Arc-Shaped Alumina Crucible FAQ

Customize Arc-Shaped Alumina Crucibles for Your Furnace or Lab Workflow

Related Products

Alumina Ceramic Crucibles & Boat with Hole for Controlled Gas Flow and Cleaner Combustion Runs

Alumina Crucible with Lid for Ashing, Thermal Analysis and Custom Furnace Use

Cylindrical Alumina Crucible for Ashing, Calcination & Melting

Rectangular Alumina Crucibles with Lid & Custom Sizes

ADCERAX - Your Trusted Advanced Ceramics Manufacturing Partner

Get in Touch with Us

Ready to Solve Your Engineering Challenge?

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